Hi

Yep, I built one a few years ago. I wanted to use an O.S. 90 4-stroke so I called Sig and asked them about doing this. They said it wouldn't work. I went ahead with it anyway and it flew just great. I don't even recall adding any balancing weight. Actually, I had more difficulty putting the wheel pants together. I am not a fan of inverted engines so I just tipped it 90 degrees to the side and cut a hole in the cowling for the head. Good luck on your project.


Jim